PWM Output Frequency

SasiKumar_Vengam — Wed, 20 Nov 2024 13:44:25 GMT

Hi,

We are using 3 PWM pins with EMIOS0 as instance in the S32k312 MCU using the S32 DS 3.5 IDE, we are getting an output frequency of 1.8k Hz for the PWM signal, but we need 10k Hz output frequency. Our core clock is running with PLL of 120M Hz.

PWM channel configuration:

clock prescaler is DIV_1
prescaler clock source is EMIOS_PWM_IP_PS_SRC_PRESCALED_CLOCK
The period is 65534
The frequency of this channel should be calculated by below formula:
output frequency = 120000000 / 1 / 65534 = 1.8k Hz
According to the formula, we have changed the default period to 12000, expecting an output frequency of 10k Hz but we are getting the same 1.8k Hz signal.
output frequency = 120000000 / 1 / 12000 = 10k Hz
Help us to get the desired frequency.

Re: PWM Output Frequency

VaneB — Wed, 20 Nov 2024 22:40:17 GMT

Hi @SasiKumar_Vengam

Check the following threads, it has information related to the topic that may be useful to you.

s32k312 emios pwm period

emios pwm configuration for 40% duty cycle of 1 second

Example S32K344 eMIOS DS3.5 RTD500

BR, VaneB

topic PWM Output Frequency in S32K

PWM Output Frequency

Re: PWM Output Frequency